在iOS中,我想实现对NSArray的地图功能。这是应用于数组每个元素的函数。最佳实现方法是什么?
谢谢,
Doug
@implementation NSArray (CMMap)
- (NSArray *) map:(id(^)(id obj))block {
NSMutableArray *a = @[].mutableCopy;
for (id o in self) {
id on = block(o);
if (!on) {
NSLog(@"NSArray::map() - object returned by block is nil!");
abort();
}
[a addObject: on];
}
return [NSArray arrayWithArray: a];
}
- (void) apply:(void(^)(id obj))block {
for (id o in self) {
block(o);
}
}
@end
NSArray
的enumerateObjectsUsingBlock:
函数。[myArray enumerateObjectsUsingBlock:^(id x, NSUInteger index, BOOL *stop) {
// Body of the function
}];
- (void)makeObjectsPerformSelector:(SEL)aSelector;
- (void)makeObjectsPerformSelector:(SEL)aSelector withObject:(nullable id)argument;
例如:
[array makeObjectsPerformSelector:@selector(doSomething)];